Mathematical Sciences Classification System
52Cxx - Discrete geometry
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                            52C05
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                            52C07
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                            52C10Erd\H os problems and related topics of discrete geometry [See also 11Hxx]
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                            52C15
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                            52C17
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                            52C20
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                            52C22
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                            52C23Quasicrystals, aperiodic tilings
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                            52C25Rigidity and flexibility of structures [See also 70B15]
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                            52C26Circle packings and discrete conformal geometry
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                            52C30Planar arrangements of lines and pseudolines
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                            52C35Arrangements of points, flats, hyperplanes [See also 32S22]
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                            52C40Oriented matroids
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                            52C45Combinatorial complexity of geometric structures [See also 68U05]
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                            52C99None of the above, but in this section